Apply black (#69)

dev-env-requirements.txt

graphene_django_optimizer/query.py

graphene_django_optimizer/types.py

graphene_django_optimizer/utils.py

setup.py

tests/graphql_utils.py

tests/models.py

tests/schema.py

tests/settings.py

tests/test_field.py

tests/test_query.py

tests/test_relay.py

tests/test_resolver.py

tests/test_types.py

tests/test_utils.py